CN112575758A - Method for recycling jacket by means of buoyancy tank - Google Patents
Method for recycling jacket by means of buoyancy tank Download PDFInfo
- Publication number
- CN112575758A CN112575758A CN202011254685.4A CN202011254685A CN112575758A CN 112575758 A CN112575758 A CN 112575758A CN 202011254685 A CN202011254685 A CN 202011254685A CN 112575758 A CN112575758 A CN 112575758A
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- China
- Prior art keywords
- jacket
- barge
- buoyancy tank
- retrieving
- adjusting
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/28—Barges or lighters
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B2017/0052—Removal or dismantling of offshore structures from their offshore location
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Transportation (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention discloses a method for recovering a jacket by using a buoyancy tank, which is characterized in that the part of the jacket above an underwater cutting position floats upwards and deflects by adjusting the load of the buoyancy tank, the tail of a barge inclines towards the sea surface by adjusting the load of the barge to generate a pitch angle so as to conveniently butt against the jacket, the jacket is butted with the barge by using a floating crane and a winch on the barge, finally the jacket is pulled to the barge by the winch on the barge, the buoyancy tank provides force for floating the jacket, the jacket is recovered by using a large floating crane, meanwhile, the floating tank continuously provides a part of upward supporting force in the process of reversely sliding the jacket onto the barge, the floating crane with a small magnitude can be selected, the defect that the traditional hoisting and dismantling method depends on the large floating crane is solved, the economic cost is saved, more choices are provided for a platform dismantling mode, the function of the buoyancy tank is fully utilized, the dependence of jacket recovering operation on the large floating crane is reduced, the engineering cost is controlled and the risk of dismantling and recycling the jacket is reduced.
Description
Technical Field
The invention relates to a method for recovering a structure in the field of ocean engineering, in particular to a method for recovering a jacket by means of a buoyancy tank.
Background
Internationally, the demolition technology of marine structures has matured relatively far, and it has been statistically counted that since 1973 the first platform was demolished in the gulf of mexico, about 2000 platforms were demolished in succession, whereas the number of demolished platforms per year, between 100 and 200, has exceeded the number of erected platforms per year. However, only individual Bohai sea shallow water platform dismantling engineering precedent exists in China so far, and the dismantling technology of large deep water jacket platforms in some fields is still a blank.
The weight and the size are main limiting factors for dismantling and recycling the large jacket, the hoisting capacity and the number of the current large crane ship are difficult to meet the requirement for integrally dismantling and recycling the large jacket, and most large jacket platforms adopt sectional cutting, hoisting and dismantling. The method has the advantages of large underwater cutting workload, high construction cost and large risk, and the factors are often restriction factors for determining whether the underwater cutting can be smoothly dismantled and recycled. Under the premise of ensuring safety, the establishment of an economical and feasible large jacket dismantling and recycling scheme and the development of related technologies are urgent.
Disclosure of Invention
The invention provides a method for recovering a large jacket by means of a buoyancy tank based on the high economic cost of the existing jacket dismantling method, which ensures the safety and has lower economic cost.
In order to solve the above technical problem, the present invention provides a method for recovering a jacket by means of a buoyancy tank, comprising the steps of:
s1: installing a buoyancy tank on a conduit frame, wherein the installation position of the buoyancy tank is higher than the cutting position of the conduit frame in the vertical direction;
s2: cutting the jacket to separate from the seabed foundation, and adjusting the load of a buoyancy tank to drive the jacket to float;
s3: driving a barge for transporting the jacket into the vicinity of the jacket, adjusting the pitch angle of the barge, adjusting the inclination angle of the jacket to be equal to the pitch angle of the barge, and butting the tail of the barge with the top end of the jacket;
s4: after the jacket is dragged into the barge for a preset distance, the barge is pulled back to a horizontal state;
s5: and dragging the jacket to a preset position of the barge to finish the jacket recovery operation.
Further, the buoyancy of the buoyancy tank in the step S1 is greater than the sum of the gravity of the jacket and the buoyancy tank.
Further, the buoyancy tank is mounted on each of the pipe legs of the jacket in the step S1.
Further, the buoyancy tank is long cylindrical and parallel to the conduit legs.
Furthermore, the inclination angle of the jacket is realized by adjusting the load of the buoyancy tank so that the top end of the jacket inclines towards the barge, and the inclination angle is adjusted by the floating crane and the winch together.
Further, when the jacket is docked with the barge in step S3, the barge tail is tilted toward the sea surface by increasing the load of the barge tail.
Further, when the jacket is butted with the barge, the top end of the jacket is opposite to the tail of the barge.
Further, when the jacket is butted up with the barge, the pitch angle of the barge is 5-25 degrees.
Further, the jacket is pulled into the barge by a winch, the cables of which are connected to the pipe legs on the side of the jacket near the sea surface.
Further, the dragging the jacket into the barge by a predetermined distance in the step S4 is specifically: the center of gravity of the jacket is located on the barge.
The invention has the technical effects that: 1. the invention relates to a method for recovering a jacket by a buoyancy tank, which is characterized in that the part of the jacket above an underwater cutting position floats and deflects by adjusting the load of the buoyancy tank, the tail part of a barge inclines towards the sea surface by adjusting the load of the barge to generate a pitch angle so as to conveniently butt against the jacket, the jacket is butted with the barge by a floating crane and a winch on the barge, and finally the jacket is pulled to the barge by the winch on the barge. The defect that the traditional hoisting and dismantling method depends on a large floating crane is overcome, the economic cost is saved, and more choices are provided for platform dismantling modes.
2. Compared with the traditional jacket dismantling and recovering method, the method for recovering the jacket by means of the buoyancy tank only needs one cutting operation, greatly saves the workload of underwater cutting operation, saves the economic cost, simplifies the flow of jacket dismantling, and improves the safety.
Drawings
FIG. 1 is a flow chart of a method of the present invention for jacket recovery with a buoyancy tank;
FIG. 2 is a schematic view of the installation position of the buoyancy tank in the jacket according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of the adjustment of the inclination angle of the jacket and barge prior to docking;
FIG. 4 is a schematic view of the jacket docked with the barge;
FIG. 5 is a schematic view of the jacket after reverse slipping a distance onto the barge;
fig. 6 is a schematic view of the barge after jacket removal operations have been completed.
The main reference numbers in the figures illustrate:
1-jacket, 2-barge, 3-buoyancy tank, 4-sea level, 5-steel wire rope, 6-cable and 11-pipe leg.
Detailed Description
The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.
The invention relates to a method for recovering a jacket by means of a buoyancy tank, which comprises the following steps:
s1: installing a buoyancy tank 3 on the jacket 1, wherein the installation position of the buoyancy tank 3 is higher than the cutting position of the jacket 1 in the vertical direction;
fig. 2 is a schematic view showing the installation position of the buoyancy tank in the jacket according to the embodiment of the present invention, and referring to fig. 2, taking a four-legged jacket 1 as an example, the buoyancy tank 3 is first installed on each of the pipe legs 11, the buoyancy of the buoyancy tank 3 needs to be greater than the sum of the gravity of the cut part of the jacket 1 and the gravity of the buoyancy tank 3, and the part above the underwater cutting position (not shown) is the jacket 1 which needs to be recovered to the barge 2 in the embodiment.
Before underwater cutting of the jacket 1, the load of the buoyancy tank 3 is adjusted in advance so that the buoyancy of the buoyancy tank 3 is equal to the gravity of the jacket 1 and the buoyancy tank 3 above the underwater cutting position, and the jacket 1 does not sink after the cutting operation is completed.
S2: cutting the jacket 1 to separate from the seabed foundation, and adjusting the load of the buoyancy tank 3 to drive the jacket 1 to float;
fig. 3 is a schematic diagram of the adjustment of the inclination angle of the jacket and barge before docking, and referring to fig. 3, reducing the load of the buoyancy tank 3 will continue to increase the buoyancy of the buoyancy tank 3, and the cut jacket 1 will gradually float up until it floats on the sea surface 4, as shown in fig. 3, and the jacket 1 floats on the sea surface 4 under the action of the buoyancy tank 3.
S3: driving a barge 2 for transporting the jacket 1 into the vicinity of the jacket 1, adjusting the pitch angle of the barge 2, adjusting the inclination angle of the jacket 2 to be equal to the pitch angle of the barge 2, and butting the tail 21 of the barge 2 with the top end 12 of the jacket 1;
as shown in fig. 3, after the barge 2 for transporting the jacket 1 is driven into the vicinity of the jacket 1, the ballast tail 21 of the barge 2 is inclined, specifically, the end of the barge 2 butted against the jacket 1 is inclined and pressed below the sea surface 4, the inclination angle of the jacket 1 is adjusted, firstly, the jacket 1 is inclined by adjusting the load of the buoyancy tank 3, as shown in fig. 3, the jacket 1 is inclined by the buoyancy tank 3, and the top end 12 of the jacket 1 faces the barge 2, fig. 4 is a schematic view of the jacket 1 butted against the barge 2, as shown in fig. 4, a hook (not shown) is tied on the waist of the jacket 1, the hook is connected to a floating crane device (not shown) through a steel wire rope 5, a cable 6 of a barge winch (not shown) is tied on the top of the jacket 1, two cables 6 of the winch are respectively connected to two conduit legs 11 on the side of the jacket 1 close to the sea level 4, the inclination angle of the jacket 1 is further precisely adjusted through the floating crane and a winch on the barge 2, specifically, the inclination angle of the jacket 1 refers to the included angle between the plane of the jacket 1 close to the sea surface 4 and the sea surface 4, and when the included angle is equal to the pitch angle of the barge 2, the jacket 1 is convenient to reversely slide to the barge 2.
During docking of the jacket 1 to the barge 2, the stern 21 of the barge 2 is always kept facing the top 12 of the jacket 1, i.e., the barge 2 is ensured to be parallel to the central axis of the jacket 1, as shown in fig. 4.
S4: after the jacket 1 is dragged into the barge 2 for a preset distance, the barge 2 is returned to a horizontal state;
after the jacket 1 is butted with the barge 2, the jacket 1 is slowly dragged to the barge by a floating crane and a winch, fig. 5 is a schematic diagram of the jacket reversely slipping to the barge for a certain distance, referring to fig. 4 and 5, in the dragging process, a part of the jacket 1 is positioned below the sea surface 4, a buoyancy tank 3 floats in the sea and can provide a part of supporting force for the jacket 1, then the jacket 1 is slowly dragged to reversely slip to the barge 2 by combining the floating crane and the winch, and the arrangement of the buoyancy tank 3 can reduce the magnitude requirement of the jacket 1 on the floating crane in the recovery operation.
Fig. 6 is a schematic view of the barge after the jacket removing operation is completed, and referring to fig. 5 and 6, after the center of gravity of the jacket 1 is positioned on the barge 2 and the inclination angle of the barge 2 is adjusted back, the barge 2 slowly holds the jacket 1, the pulling force of the floating crane on the jacket 1 is reduced, and when the pulling force of the steel wire rope 5 on the jacket 1 is reduced to zero, the barge 2 is in a horizontal state.
S5: and dragging the jacket 1 to a preset position of the barge 2 to finish the recovery work of the jacket 1.
Referring to fig. 6, when the barge 2 is in a horizontal state, the floating crane hook is removed, the jacket 1 is pulled to a preset position on the barge 2 through a winch on the barge 2, and finally, the winch cable 6 is detached from the jacket 1, so that the jacket 1 is detached and is smoothly recovered to the barge 2.
Referring to fig. 2 to 6, a further improvement is that: the buoyancy tank 3 is connected to the conduit legs 11 by hydraulic clamps, and the buoyancy tank 3 may be installed in other ways.
The further improvement lies in that: the buoyancy tanks 3 are long cylindrical and are respectively arranged in parallel with the guide pipe legs 11, so that the guide pipe frame 1 can slide to the barge 2 reversely.
The further improvement lies in that: when the jacket 1 is butted with the barge 2, the pitch angle of the barge 2 is 5-25 degrees.
The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. A method for recovering jackets by means of a pontoon, characterized in that it comprises the following steps:
s1: installing a buoyancy tank on a conduit frame, wherein the installation position of the buoyancy tank is higher than the cutting position of the conduit frame in the vertical direction;
s2: cutting the jacket to separate from the seabed foundation, and adjusting the load of a buoyancy tank to drive the jacket to float;
s3: driving a barge for transporting the jacket into the vicinity of the jacket, adjusting the pitch angle of the barge, adjusting the inclination angle of the jacket to be equal to the pitch angle of the barge, and butting the tail of the barge with the top end of the jacket;
s4: after the jacket is dragged into the barge for a preset distance, the barge is pulled back to a horizontal state;
s5: and dragging the jacket to a preset position of the barge to finish the jacket recovery operation.
2. A method of retrieving a jacket as claimed in claim 1, wherein: the buoyancy of the buoyancy tank in the step S1 is greater than the sum of the gravity of the jacket and the buoyancy tank.
3. A method of retrieving a jacket as claimed in claim 1, wherein: the buoyancy tank is mounted on each pipe leg of the jacket in the step S1.
4. A method of retrieving a jacket as claimed in claim 3, wherein: the buoyancy tank is long cylindrical and parallel to the conduit legs.
5. A method of retrieving a jacket as claimed in claim 1, wherein: the inclination angle of the jacket is realized by adjusting the load of the buoyancy tank, so that the top end of the jacket inclines towards the barge, and the inclination angle is adjusted by the floating crane and the winch together.
6. A method of retrieving a jacket as claimed in claim 1, wherein: when the jacket is docked with the barge in step S3, the barge tail is tilted toward the sea surface by increasing the load of the barge tail.
7. The method of retrieving a jacket according to claim 6, wherein: when the jacket is butted with the barge, the top end of the jacket is opposite to the tail of the barge.
8. The method of retrieving a jacket according to claim 6, wherein: when the jacket is butted up with the barge, the pitch angle of the barge ranges from 5 degrees to 25 degrees.
9. A method of retrieving a jacket according to claim 5, wherein: the jacket is pulled into the barge by a winch, the cables of which are connected to the pipe legs on the side of the jacket near the sea surface.
10. The method for recovering jacket according to claim 1, wherein said step S4 of towing the jacket into the barge by a predetermined distance is: the center of gravity of the jacket is located on the barge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011254685.4A CN112575758A (en) | 2020-11-11 | 2020-11-11 | Method for recycling jacket by means of buoyancy tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011254685.4A CN112575758A (en) | 2020-11-11 | 2020-11-11 | Method for recycling jacket by means of buoyancy tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112575758A true CN112575758A (en) | 2021-03-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011254685.4A Pending CN112575758A (en) | 2020-11-11 | 2020-11-11 | Method for recycling jacket by means of buoyancy tank |
Country Status (1)
| Country | Link |
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| CN (1) | CN112575758A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114620196A (en) * | 2022-03-31 | 2022-06-14 | 中海石油(中国)有限公司 | Jacket buoy device and three-leg jacket installation method with buoy device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86100433A (en) * | 1985-09-11 | 1987-11-25 | 默克德莫特国际公司 | The articulated barge that ocean structure haul and following water are used |
| GB8907432D0 (en) * | 1989-04-03 | 1989-05-17 | Lee Malcolm | Offshore platform recovery and re-use unit |
| US20050152748A1 (en) * | 2002-03-06 | 2005-07-14 | Gunnar Tangen | Method for underwater transportation and installation or removal of objects at sea |
| CN105200970A (en) * | 2015-08-31 | 2015-12-30 | 中国海洋石油总公司 | Method for dismantling discarded jacket through air bags |
| CN108202847A (en) * | 2016-12-19 | 2018-06-26 | 龙口中集来福士海洋工程有限公司 | Small floating thing launching method |
| CN111074870A (en) * | 2019-12-13 | 2020-04-28 | 中国海洋大学 | System and method for disassembling large-scale offshore fixed platform jacket |
-
2020
- 2020-11-11 CN CN202011254685.4A patent/CN112575758A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86100433A (en) * | 1985-09-11 | 1987-11-25 | 默克德莫特国际公司 | The articulated barge that ocean structure haul and following water are used |
| GB8907432D0 (en) * | 1989-04-03 | 1989-05-17 | Lee Malcolm | Offshore platform recovery and re-use unit |
| US20050152748A1 (en) * | 2002-03-06 | 2005-07-14 | Gunnar Tangen | Method for underwater transportation and installation or removal of objects at sea |
| CN105200970A (en) * | 2015-08-31 | 2015-12-30 | 中国海洋石油总公司 | Method for dismantling discarded jacket through air bags |
| CN108202847A (en) * | 2016-12-19 | 2018-06-26 | 龙口中集来福士海洋工程有限公司 | Small floating thing launching method |
| CN111074870A (en) * | 2019-12-13 | 2020-04-28 | 中国海洋大学 | System and method for disassembling large-scale offshore fixed platform jacket |
Non-Patent Citations (1)
| Title |
|---|
| 王亮: "气囊助浮吊装导管架的关键技术研究及工程应用", 《石油和化工设备》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114620196A (en) * | 2022-03-31 | 2022-06-14 | 中海石油(中国)有限公司 | Jacket buoy device and three-leg jacket installation method with buoy device |
| CN114620196B (en) * | 2022-03-31 | 2023-02-21 | 中海石油(中国)有限公司 | Jacket buoy device and three-leg jacket installation method with buoy device |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210330 |
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| RJ01 | Rejection of invention patent application after publication |